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array-spread.js
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72 lines (60 loc) · 1.44 KB
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// RUN: %hermes -O %s | %FileCheck --match-full-lines %s
// RUN: %hermes -O -emit-binary -out %t.hbc %s && %hermes %t.hbc | %FileCheck --match-full-lines %s
print('array spread');
// CHECK-LABEL: array spread
print([...[]].length);
// CHECK-NEXT: 0
var arr = [...[1,2,3]];
print(arr, arr.length);
// CHECK-NEXT: 1,2,3 3
var arr = [...[1,2,3],'a','b'];
print(arr, arr.length);
// CHECK-NEXT: 1,2,3,a,b 5
var arr = ['a','b',...[1,2,3],'c','d'];
print(arr, arr.length);
// CHECK-NEXT: a,b,1,2,3,c,d 7
var arr = ['a','b',...[1,2,3],'c',...[4,5,6],'d'];
print(arr, arr.length);
// CHECK-NEXT: a,b,1,2,3,c,4,5,6,d 10
var arr0 = [1,,3];
var arr = [...arr0];
print(arr);
// CHECK-NEXT: 1,,3
var arr0 = [];
arr0[Symbol.iterator] = function*() {
yield 1;
yield 2;
}
var arr = [...arr0];
print(arr);
// CHECK-NEXT: 1,2
var arr0 = [1,,3];
arr0.__proto__[1] = 'in_proto';
var arr = [...arr0];
print(arr);
// CHECK-NEXT: 1,in_proto,3
delete arr0.__proto__[1];
var arr0 = Array(1000);
var arr = [...arr0];
print(arr.length);
// CHECK-NEXT: 1000
var count = 4;
var iterator = {
[Symbol.iterator]() {
return {
next() {
--count;
return {value: count, done: count < 0};
}
}
}
}
var arr = [...iterator];
print(arr, arr.length)
// CHECK-NEXT: 3,2,1,0 4